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RDMA/bnxt_re: Change the sequence of updating the CQ toggle value

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Currently the CQ toggle value in the shared page (read by the userlib) is
updated as part of the cqn_handler. There is a potential race of
application calling the CQ ARM doorbell immediately and using the old
toggle value.

Change the sequence of updating CQ toggle value to update in the
bnxt_qplib_service_nq function immediately after reading the toggle value
to be in sync with the HW updated value.

Fixes: e275919d96 ("RDMA/bnxt_re: Share a page to expose per CQ info with userspace")
Link: https://patch.msgid.link/r/1728373302-19530-9-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Chandramohan Akula
2024-10-08 00:41:40 -07:00
committed by Jason Gunthorpe
parent a5e099e0c4
commit 2df411353d
2 changed files with 6 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/infiniband/hw/bnxt_re/main.c
View File

@@ -1274,15 +1274,9 @@ static int bnxt_re_cqn_handler(struct bnxt_qplib_nq *nq,
{
struct bnxt_re_cq *cq = container_of(handle, struct bnxt_re_cq,
qplib_cq);
u32 *cq_ptr;
if (cq->ib_cq.comp_handler) {
if (cq->uctx_cq_page) {
cq_ptr = (u32 *)cq->uctx_cq_page;
*cq_ptr = cq->qplib_cq.toggle;
}
if (cq->ib_cq.comp_handler)
(*cq->ib_cq.comp_handler)(&cq->ib_cq, cq->ib_cq.cq_context);
}
return 0;
}

5
drivers/infiniband/hw/bnxt_re/qplib_fp.c
View File

@@ -327,6 +327,7 @@ static void bnxt_qplib_service_nq(struct tasklet_struct *t)
case NQ_BASE_TYPE_CQ_NOTIFICATION:
{
struct nq_cn *nqcne = (struct nq_cn *)nqe;
struct bnxt_re_cq *cq_p;
q_handle = le32_to_cpu(nqcne->cq_handle_low);
q_handle |= (u64)le32_to_cpu(nqcne->cq_handle_high)
@@ -337,6 +338,10 @@ static void bnxt_qplib_service_nq(struct tasklet_struct *t)
cq->toggle = (le16_to_cpu(nqe->info10_type) &
NQ_CN_TOGGLE_MASK) >> NQ_CN_TOGGLE_SFT;
cq->dbinfo.toggle = cq->toggle;
cq_p = container_of(cq, struct bnxt_re_cq, qplib_cq);
if (cq_p->uctx_cq_page)
*((u32 *)cq_p->uctx_cq_page) = cq->toggle;
bnxt_qplib_armen_db(&cq->dbinfo,
DBC_DBC_TYPE_CQ_ARMENA);
spin_lock_bh(&cq->compl_lock);